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基于上下部共同作用的柔性基础下复合地基性状研究 TU47 文献标识码：A 文章编号：1000–4548(2010)05–0657–07 作者简介：俞建霖(1972– )，男，福建福清人，博士，副教授，硕士生导师，主要从事软黏土力学、地基处理及基坑工程等方面的研究与教学工作。E-mail: yujianlin72@126.com。 Working behaviors of composite ground under flexible foundation based on super-sub structure interaction YU Jian-lin1, JING Zi-jing1, GONG Xiao-nan1, LIU Chao1, 2, Lü Wen-zhi1，3 (1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310027, China; 2. Shandong Electric Power Engineering Consulting Institute, Jinan 250013, China; 3. MWR Key Laboratory of Geotechnic Mechanics and Engineering, Yangtz River Scientific Research Institute, Wuhan 430010, China) Abstract: Based on the deformation characteristics of composite ground under the flexible foundation, the composite ground is divided into four parts, including fill, cushion, composite foundation, and underlying layer. Through the analysis of a typical element, a simplified analytical model, which considers the above four parts as an interactive system, allows for the relative movement between piles and soils and assumes different settlements of foundation soil at the same level plane, is presented. And then according to the compatibility of stress and deformation on the interfaces between these four components, the formulas on settlement and stress ratio of pile-soil, which is used to characterize the behaviors of the composite ground, are derived. Finally, it is demonstrated that the results from this solution are in accordance with the measured ones of a project. So the proposed method can reflect the working behaviors of composite ground under the flexible foundation favorably. Key words: composite ground under flexible foundation; analytical solution; load transfer; relative movement0 引 言 lamgir[2]提出了考虑桩、土沉降非同步性，忽略径向位移的位移模式，推导了柔性基础下端承桩复合地基桩身应力、桩侧摩阻力以及沉降计算的解析式；杨涛[3]通过引进“中性点”的概念假设中性点位置和桩侧摩阻力分布，推导了柔性基础下悬桩复合地基的沉降公式；刘杰[4]等在Alamgir假设的基础上，考虑径向变形，推导了柔性基础下复